198c976f7e
that passes signal map along. This mechanisms is also used for nonuser signals like SIGKMESS, SIGKSTOP, SIGKSIG. Revised comments of many system call handlers. Renamed setpriority to nice.
26 lines
989 B
C
26 lines
989 B
C
#ifndef IPC_H
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#define IPC_H
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/* Masks and flags for system calls. */
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#define SYSCALL_FUNC 0x0F /* mask for system call function */
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#define SYSCALL_FLAGS 0xF0 /* mask for system call flags */
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#define NON_BLOCKING 0x10 /* prevent blocking, return error */
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#define FRESH_ANSWER 0x20 /* ignore pending notifications as answer */
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/* (default behaviour for SENDREC calls) */
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/* System calls (numbers passed when trapping to the kernel). */
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#define ECHO 0 /* function code for echoing messages */
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#define SEND 1 /* function code for sending messages */
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#define RECEIVE 2 /* function code for receiving messages */
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#define SENDREC 3 /* function code for SEND + RECEIVE */
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#define NOTIFY 4 /* function code for notifications */
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#define ALERT 5 /* function code for alerting */
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/* Call masks indicating which system calls a process can make. */
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#define EMPTY_CALL_MASK (0)
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#define USER_CALL_MASK (1 << SENDREC)
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#define SYSTEM_CALL_MASK (~0)
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#endif /* IPC_H */
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