65 lines
1.1 KiB
C
65 lines
1.1 KiB
C
/** Linux system call interface.
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* Written by Shaun Jackman <sjackman@gmail.com>.
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* Copyright 2006 Pathway Connectivity
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*
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* Permission to use, copy, modify, and distribute this software
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* is freely granted, provided that this notice is preserved.
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*/
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#include <errno.h>
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#include <stdint.h>
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extern char _end[];
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static void *curbrk = _end;
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extern void *_brk(void *addr);
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int brk(void *addr)
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{
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void *newbrk;
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if (curbrk == addr)
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return 0;
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newbrk = _brk(addr);
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curbrk = newbrk;
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if (newbrk < addr) {
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errno = ENOMEM;
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return -1;
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}
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return 0;
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}
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void *_sbrk(intptr_t incr)
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{
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void *oldbrk = curbrk;
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if (brk(oldbrk + incr) == -1)
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return (void *)-1;
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return oldbrk;
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}
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void *sbrk(intptr_t incr) __attribute__((alias("_sbrk")));
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int _set_errno(int n)
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{
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if (n < 0) {
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errno = -n;
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return -1;
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}
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return n;
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}
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#include <sys/wait.h>
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struct rusage;
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pid_t wait4(pid_t pid, int *status, int options, struct rusage *rusage);
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pid_t _wait(int *status)
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{
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return wait4(-1, status, 0, NULL);
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}
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pid_t waitpid(pid_t pid, int *status, int options)
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{
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return wait4(pid, status, options, NULL);
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}
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